Square Horizon is Huidobro's first book in French and is heavily influenced by the work of Apollinaire, but it marks the author's definitive arrival on the avant-garde scene in Paris, and kicks off a frenetic period of two years in which he published two full collections and four chapbooks.

Huidobro published Horizon carre in Paris in 1917), and quickly followed it with Tour Eiffel (in French and Spanish; Madrid, 1918), Hallali (in French; Madrid, 1918); Ecuatorial (in Spanish; Madrid, 1918), Poemas articos, likewise published in Spanish in Madrid, and El espejo de agua, a Spanish-language volume from 1916, reissued in Madrid in 1918. Horizon carre is heavily influenced by the work of Guillaume Apollinaire and marks Huidobro's definitive arrival on the avant-garde scene in Paris, even if-it has to be said-the volume is derivative. Huidobro's French was good even before he arrived in Paris: he had been educated well in Santiago, but this would not have prepared him for the linguistic and intellectual ferment he would find upon arrival in the main seat of the international avant-garde. Many of his early French-language manuscripts show signs of corrections by his friends at the time-the French poet, Pierre Reverdy and the Spanish artist, Picabia, both being among them.